@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The IsIconic API !!!!C# Signature: [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool IsIconic(IntPtr hWnd); !!!!VB Signature: Private Declare Auto Function IsIconic Lib "user32.dll" (ByVal hwnd As IntPtr) As Boolean !!!!User-Defined Types: None. !!!!Notes: The hWnd parameter can be obtained by the Handle property of a Form, or by MainWindowHandle on a Process. The corresponding unmanaged return type is a 4-byte Win32 'BOOL', so mark the method with the MarshalAsAttribute(UnmanagedType.Bool). !!!!Tips & Tricks: Please add some! !!!!Sample Code - C# - sivakumar.keerthi using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Runtime.InteropServices; using System.Diagnostics; namespace WindowsApplication1 { /// <summary> /// Summary description for Form1. /// </summary> public class Form1 : System.Windows.Forms.Form { /// <summary> /// Required designer variable. /// </summary> [DllImport("user32.dll")] public static extern IntPtr FindWindow( string sClsName , string sWndName ); [DllImport("user32.dll")] public static extern int SetForegroundWindow( IntPtr Hwnd ); [DllImport("user32.dll")] public static extern int ShowWindow( IntPtr Hwnd , int iCmdShow ); [DllImport("user32.dll")] public static extern bool IsIconic( IntPtr Hwnd ); private const int iRestore = 9; private const int iShow = 5; private System.ComponentModel.Container components = null; public Form1() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(528, 266); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); } #endregion /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Process[] p = Process.GetProcessesByName( Process.GetCurrentProcess().ProcessName , Environment.MachineName ); if ( p.Length > 1 ) { MessageBox.Show( "Already one instance is running......." ); Form1 Frm = new Form1(); Frm.ShowForm(); return; } else Application.Run(new Form1()); } private void ShowForm() { IntPtr Hwnd = FindWindow( null , "Form1" ); if ( Hwnd.ToInt32() > 0 ) { SetForegroundWindow( Hwnd ); if ( IsIconic( Hwnd ) ) ShowWindow( Hwnd , iRestore ); else ShowWindow( Hwnd , iShow ); } } } } !!!!Sample Code: // Want only one instance of an application? [DllImport("User32.Dll")] private static extern bool SetForegroundWindow(IntPtr hWnd); [DllImport("User32.Dll")] private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow); [DllImport("User32.Dll")] private static extern bool IsIconic(IntPtr hWnd); private const int SW_RESTORE = 9; /// <summary> /// Main entry point for the application. /// </summary> [STAThread] static int Main ( string[] arguments ) { // Check for running instance Process thisProcess = Process.GetCurrentProcess(); Process[] processes = Process.GetProcessesByName(thisProcess.ProcessName); if (processes.Length > 1) { // One is us (which will end); the other we activate int index = 0; if (processes[index].Id == thisProcess.Id) index = 1; IntPtr hWnd = processes[index].MainWindowHandle; if (IsIconic(hWnd)) ShowWindowAsync(hWnd, SW_RESTORE); SetForegroundWindow(hWnd); // Exit return 0; } // Normal startup code continues here... } !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: IsIconic@msdn on MSDN
Edit user32.IsIconic
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